800 tons of DU is the atomicity equivalent of 83,000 Nagasaki bombs. The U.S. has used more DU since 1991 than the atomicity equivalent of 400,000 Nagasaki bombs. Four nuclear wars indeed, and 10 times the amount of radiation released into the atmosphere from atmospheric testing! SOURCE: http://www.ratical.org/radiation/DU/KYagasakiOnDU.pdf